Public bug reported:

Binary package hint: coreutils

The rm command includes a "--preserve-root" option to prevent the
accidental deletion of the root directory, but that behavior is not the
default in Ubuntu 7.04 or 7.10. According to the Ubuntu man pages for
rm, "--no-preserve-root" is the default.

Reversing this default would help protect new Ubuntu users, who may or
may not understand the effects rm can have on the root directory. This
weakness, and the repercussions it has, is best described by forum
administrator jdong here:

http://ubuntuforums.org/announcement.php?f=153

Experienced users who need (for some reason) to remove an entire root
directory would no doubt find a way to circumvent that particular
behavior, most likely with the "--no-preserve-root" flag, or a variation
on the command.

To reproduce this bug, install Ubuntu and issue the "sudo rm -rf /"
command from a terminal. Of course, this should not be done from a
virtual environment, or from a spare installation. :)

** Affects: coreutils (Ubuntu)
     Importance: Undecided
         Status: New

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rm does not preserve root by default
https://bugs.launchpad.net/bugs/174283
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